Science: Inventions

Sounding. Into Manhattan steamed the
French liner Paris, bearing storm scars, notables, a squad of German
engineers and a new German device for deep-sea sounding with which the
engineers had experimented on the way over from Havre. This device
consisted of a gun on the port side, a microphone abreast on the
keel's starboard side, a dial on the bridge. The gun fired a cartridge
overside, which exploded a fathom under water. The microphone
registered this explosion's last echo from the bottom, permitting the
depth...